unicorn/no-instanceof-array Pedantic

🛠️ An auto-fix is available for this rule.

What it does

Require Array.isArray() instead of instanceof Array.

Why is this bad?

The instanceof Array check doesn't work across realms/contexts, for example, frames/windows in browsers or the vm module in Node.js.

Examples

Examples of incorrect code for this rule:

array instanceof Array;
[1, 2, 3] instanceof Array;

Examples of correct code for this rule:

Array.isArray(array);
Array.isArray([1, 2, 3]);

How to use

To enable this rule using the config file or in the CLI, you can use:

Config (.oxlintrc.json)

{
  "rules": {
    "unicorn/no-instanceof-array": "error"
  }
}

CLI

oxlint --deny unicorn/no-instanceof-array

References

• Rule Source